Depends on what you are doing with it. There are lots of throw it in and run it engines around. I've got two sitting in chassis with less than 10 k on em, hear em run. For a price that won't get you out of the machine shop much less any parts. The bad? they are 30 years old, low miles or not. Or redwings fan has one all already to go fresh rebuild by punkscaler for what, $1,000?? If you have time and and the knowledge or want to learn to new skills then build away. Generally bike traders won't touch engine work there are plenty of runners out there.